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<title>acc_present_or_copyin (GNU libgomp)</title>

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<span id="acc_005fpresent_005for_005fcopyin"></span><div class="header">
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<span id="acc_005fpresent_005for_005fcopyin-_002d_002d-If-the-data-is-not-present-on-the-device_002c-allocate-device-memory-and-copy-from-host-memory_002e"></span><h3 class="section">6.19 <code>acc_present_or_copyin</code> &ndash; If the data is not present on the device, allocate device memory and copy from host memory.</h3>
<dl compact="compact">
<dt><em>Description</em></dt>
<dd><p>This function tests if the host data specified by <var>a</var> and of length
<var>len</var> is present or not. If it is not present, then device memory
will be allocated and the host memory copied. The device address of
the newly allocated device memory is returned.
</p>
<p>In Fortran, two (2) forms are supported. In the first form, <var>a</var> specifies
a contiguous array section. The second form <var>a</var> specifies a variable or
array element and <var>len</var> specifies the length in bytes.
</p>
<p>Note that <code>acc_present_or_copyin</code> and <code>acc_pcopyin</code> exist for
backward compatibility with OpenACC 2.0; use <a href="acc_005fcopyin.html">acc_copyin</a> instead.
</p>
</dd>
<dt><em>C/C++</em>:</dt>
<dd><table>
<tr><td width="20%"><em>Prototype</em>:</td><td width="80%"><code>void *acc_present_or_copyin(h_void *a, size_t len);</code></td></tr>
<tr><td width="20%"><em>Prototype</em>:</td><td width="80%"><code>void *acc_pcopyin(h_void *a, size_t len);</code></td></tr>
</table>

</dd>
<dt><em>Fortran</em>:</dt>
<dd><table>
<tr><td width="20%"><em>Interface</em>:</td><td width="80%"><code>subroutine acc_present_or_copyin(a)</code></td></tr>
<tr><td width="20%"></td><td width="80%"><code>type, dimension(:[,:]...) :: a</code></td></tr>
<tr><td width="20%"><em>Interface</em>:</td><td width="80%"><code>subroutine acc_present_or_copyin(a, len)</code></td></tr>
<tr><td width="20%"></td><td width="80%"><code>type, dimension(:[,:]...) :: a</code></td></tr>
<tr><td width="20%"></td><td width="80%"><code>integer len</code></td></tr>
<tr><td width="20%"><em>Interface</em>:</td><td width="80%"><code>subroutine acc_pcopyin(a)</code></td></tr>
<tr><td width="20%"></td><td width="80%"><code>type, dimension(:[,:]...) :: a</code></td></tr>
<tr><td width="20%"><em>Interface</em>:</td><td width="80%"><code>subroutine acc_pcopyin(a, len)</code></td></tr>
<tr><td width="20%"></td><td width="80%"><code>type, dimension(:[,:]...) :: a</code></td></tr>
<tr><td width="20%"></td><td width="80%"><code>integer len</code></td></tr>
</table>

</dd>
<dt><em>Reference</em>:</dt>
<dd><p><a href="https://www.openacc.org">OpenACC specification v2.6</a>, section
3.2.20.
</p></dd>
</dl>






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